Sound-muffling pad for typewriting machines



I L. c. MYERS. SOUND MUFFLING PAD FOR TYPEWRITING MACHINE APPLICATIONFILED AUG.22

Patented June 13,1922.

,. To all whom it may concern:

. UNITED STATES:

PATENT O ICE.

LEWIS o. MYERS, or BROOKLYNQNEW YORK, ASSIGNOR TO ROYAL 'IYPEWRITERCOMPANY, me, or NEW YORK, N. Y., A CORPORATION or NEW Y RK.

souND-murrLINe ran Fort rirnwmrme M'AcmNEs.

, 'Be it known that 1,.LEWIS CJMYERS, a

\ citizen of the United States, residin -in illustrated in Figsul and,2.

Brooklyn, in the county of Kings and tate of New York, have inventedcertain new and useful Improvements in Sound- Muflling Pads forTypewriting Machines, of which the following is a specification.

The object of this invention is to provide means for absorbing shocksand mufltling or deadening sounds produced by a typewriting machinewhile in operation which sounds are, as a rule, transmitted to the deskor table on which the machine is supported and areby such supportincreased to a very large extent. .These sounds are largely produced bythe shifting for upper and lower case printing and are responsible for alarge part of the noise produced inthe operation of the machine.

According to my invention I provide a.

pad, mat or cushion which is preferably made of such size as to extendentirely across the rear part of the machine behind the key-board, andit is constructed of relatively soft, sound-mufiling material reinforcedor stiffened with comparatively rigid material. with means for attachingit'to the frame of the machine, and preferably it is equipped withdevices for securing it to a desk or table top on which the machine issupported.

. My improvements are illustrated in the accompanying drawings, inwhich- 35 Figure 1 1s a side, view of-apart of the frameof a typewritingmachine to which the pad is attached, and itgalso shows part ferred formof pad, with parts broken away to show details of construction. Figure 3is a view in sectionof the pad Figure 4 is a plan view of the pad.showin how'its edges are preferably'formed. Figure 5 is a'plan'view ofone form of stiffening layer that maybe used. r Figure 6 "1s a plan viewof 'anoth'erform of stifi'eningiayer which may be employed. A partof-the side of the frame of a Royal typewriting machine is indicated atA. This frameis formed with? feet (a-as usual, and

it will be observed that these feet extend for only a short distancebelow theedges of Preferably the pad is provided Specification ofLetters Patent. Patented June 13, 1922.

- Application filed August 22, 1921. Serial 1T0 484,819. I

the main frame. Usually individual pads are attached to these feet, butaccording to my invention these individual pads are discarded and theuniversal pad illustrated is employed. The pad as a whole extends underthe entire rear part of the machine where a large part of thenoise-produclng mechanism is located.

As shown in- Fig. 1, the pad is secured to i support T and the frame ofthe machine through which noises could pass and as is well known intheRoyal machine panels A'- of glass are employed and. thus thereare noside-openings in the frame. ,7

The details of construction of the pad shown are of importance. The padembodies in its constructionsoft material, suchas felt, which is a goodsound deadener or muffler, and means for stiffening it and holding it ina fiat condition,"such stifi'ening means. also serving in attaching thepad securely to the machine and to the support.

. In the preferred construction a layer of stiffening material, such aswood veneer or metal, is interposed between two layers of felt orsimilar material. The drawings showtwo layers offelt' b, 7)", two layersof.

"v eer 0,10 and a layer of felt d interposed between the layers a, c ofveneer as'this construction has been found to be serviceableandefiicient.

' A pad having the characteristics thereof or to a desk" or not. The padwill always lie flat on its support and W111 pr0perly sustain themachine.

ers ma be connected with each other by cementing. material or otherwise,if desired. When it is desirable to attach the pad to the machine I doso by screws Dwhich extend through holes in the corners of the pad, inthe manner shown, and engage above 1 7 described may be used. with atypewriting .machine whether it be attached to the frame The severallaytapped holes in the feet of the machine.

When it is desirable to attach the machine to 'a desk, table or othersupport, instead of employin metal clamps which engage the machine frameand the desk top, I employ screws or other fastening devices E whichextend through the desk top and engage the pad, as shown. Preferablyplates 6 are secured to one of the stiffening layers which are formedwith tapped bosses 6 with which I typewriting machine of a soundmuffiing the screws E engage. It will thus be seen that by attaching thepad to the machine and then attaching the pad to the desk or table thereis no direct metallic connection between the machine frame and itssupport and therefore sounds are not freely transmitted but are muffled,i. e., are very largely eliminated. In plan the pad is referably of theshape shown in Fig. 4 and its edges are preferably serrated or pinked asin this way the edges are made more durable.

Instead of using wood veneer for the stiffenin material I may employ asheet metal mem er C, shown in Fig. 5, and to stiffen this material itmay be corrugated, as shown.

In order to reduce the weight of the stiffening material it may beperforated, as is shown in the pad D, Fig. 6.

I claim as my invent10n:

1. A sound-muffling pad, comprising a layer of sound-mufiling material,a layer of stiffening material, and devices attached to the pad forreceivin means for securing the pad to a support.

2. A sound-muffiing pad, comprising a layer of sou'nd-muffling material,a layer of stiffening material, and metal plates attached to thestiffening material adapted to receive means for securing the pad to asupport.

3. A sound-muffiing pad comprising a plurality of layers ofsound-muffling material, an interposed layer of stiffening material,means attached to the stiffening material for receiving devices forsecuring the pad to a support, and means for receiving devices forsecuring it to a machine.

4. The combination with the frame of a pad underlying the same, andmeans adjustably connected to the frame and engaging the pad to forcethe same into firm contact with the edges of the frame between thecorners thereof, thus closing the bottom of the frame.

5. A sound-muffiing pad, comprising a plurality of layers ofsound-muffling' material, a plurality of layers of stiffening material,means engaging the lower layer of stiffening material to fasten the padto a machine frame, and means engaging. the

upper layer of stiffening material to fasten -the pad to a support.

6. A sound-muffling pad, com rising a.

plurality of layers of sound-mu ing material, a plurality of layers ofstiffening material, a layer of sound-muffiing material interposedtherebetween, means engaging the lower layer of stiffening material tofasten the padto a machine frame, and means engaging'the upper layer ofstiffening material to fasten the pad to a support.

In testimony whereof, I have hereunto subscribed my name.

' LEWIS o. MYERS.

